Little Alchemy is a bet on trial and error.
It’s free, and it’s designed for iPhone and Android (through Google Play); you can also play online.

The guidelines of play are simple. You start with four elements: air, earth, fire, and water, which appear as icons on your screen. By adding any two elements together, you receive another “element,” which might or will not be combinable consequently. Elements are added by dragging one over another, at which either nothing happens (since they don’t make something new), or a new icon appears within their place. You can include a component to itself; air + air = pressure, as an example. There are 560 items you can make, plus one bonus item (which I found about halfway through.) You’ll find yourself dropping and dragging once you have a very matter of minutes to spare, trying to create yet another element.

The screen shows the elements you’ve already made around the right; the left side from the screen is good for combining elements. A counter towards the bottom shows you the amount of elements you’ve created from the potential 560. (The screenshot was apparently taken within the earlier iteration with the game, when only 500 elements could possibly be created.) It is possible to set the library to exhibit either all of the elements you’ve created, or exactly the ones that may sometimes be combined; “final elements” will be the end with the road and can’t be used to create additional factors. You can also choose to have final elements underlined, so you can tell them apart. “Flood” inside the screenshot is often a final element.

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